The Karma Club by Jessica Brody

This book is about a girl named Maddy Kasparkova, and her 2 friends Jade and Angie. After Maddy suffers a breakup, they start a club-the Karma Club, and they plan revenge on all the people who hurt them. After every plan that went right, they added a new charm on their Karma bracelets. But soon horrible things start happening to Maddy, Jade, and Angie. Was this Karma getting back at them for all the bad things they're doing to other people? Maddy doesn't get it! She's just balancing out the world! Isn't that what Karma is all about?  -Mariah